This tropical plant does not survive cold temperatures, so you must take steps to overwinter it.
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If you have sufficient room in your house, grow it as a houseplant over the winter.
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If you lack space, locate it in a storage area and allow it to go dormant.
If you have been growing it in the ground, you will have to pot it up.
If you find any pests,spray them with neem oil.
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Temperatures in the 50s (F) will be ideal.
Water the plant only when the soil is completely dry.
Remove some of the older stems, along with any stems that are crisscrossing.
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This will open up the plant (improving air circulation) and reinvigorate it.
Mandevilla plants can tolerate temperatures only as low as 45 to 50 Fahrenheit.
Unaided, mandevilla comes back next year only in the tropics.
